Run a simple Zenoh pub/sub example

Test Zenoh pub/sub across two devices

This example demonstrates how to use Zenoh’s real-time publish/subscribe model to exchange messages between two Raspberry Pi devices over a local network.

Pub/sub is a core Zenoh communication pattern where data producers (publishers) send values to a key, and data consumers (subscribers) receive updates for matching key expressions. In this case, the subscriber listens for all messages published under the key expression demo/example/**, which matches any topic that begins with demo/example/. This enables flexible topic filtering and lightweight data dissemination across distributed systems.

Start the subscriber node

Run the subscriber example on one of the Raspberry Pi systems:

    

        
        
cd ~/zenoh/target/release/examples
./z_sub

    

Start the publisher node

Then, log in to the other Raspberry Pi and run the publisher:

    

        
        
cd ~/zenoh/target/release/examples
./z_pub

    

Observe the pub/sub data flow

The results are shown below:

Simple Pub/Sub

The left-side window shows the z_sub program. It receives values with the key demo/example/zenoh-rs-pub continuously published by z_pub running in the right-side window.

This example confirms that Zenoh’s zero-configuration peer discovery and real-time pub/sub communication are working correctly across physical nodes.